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Question

An organic compund ′A′ on treatment with NH3 gives ′B′ which on heating gives ′C′, ′C′ when treated with Br2 in the presence of KOH produces ethylamine. Compound ′A′ is :

A
CH3 CH2 COOH
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B
CH3COOH
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C
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D
CH3 CH2 CH2 COOH
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Solution

The correct option is A CH3 CH2 COOH
Br2/KOH is the reagent for Hoffmann bromamide reaction. In this reaction amide is coverted primary amine.
Thus, 'C' is an amide.
Carboxylic salt on heeating gives amide.
Thus, 'A' is a carboxylic acid which on reaction with NH3 forms salt.
Product of hoffmann bromamide reaction is ethamine. Thus, 'A' is ethanoic acid.

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